What are these relays - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hair · 06-09-2008, 01:16 PM

What is the bigger relay to the upper right of the fuse box? Mine is burnt up and it was making my battery go dead over night. I unhooked it and now I don't miss anything and my battery is good, so what does it do and what is it?

Also, what is the smaller relay at the borrom right of the fuse box? Both of the wires that are hooked to mine are cut, so what is it supposed to do?

Hair · 06-09-2008, 01:32 PM

This one right here.

rscam · 06-09-2008, 01:39 PM

Big one is the Horn relay. I just replaced mine yesterday. Someone else will have to help with the smaller one. If not look on here for wiring diagrams and trace the wires. Thats how I found the horn relay.

Hair · 06-09-2008, 01:46 PM

Could it be an anti-dieseling relay?

**john** · 06-09-2008, 01:55 PM

The small one looks like a circuit breaker to me.

Luvlegs · 06-09-2008, 02:09 PM

I've had 67, 68, 70 and 72 fuse blocks in my hands and haven't seen a relay/circuit breaker there before....

I'm gonna sit down now case'n I learn sumpin new...

matthufham · 06-09-2008, 02:13 PM

the lower one isn't factory

Hair · 06-09-2008, 02:14 PM

Oh, by the way, this is a 1971 GMC 6 cylinder, 2wd 1/2 ton with no A/C.

Lugnut64052 · 06-09-2008, 02:15 PM

The smaller one (with your finger on it in the first picture) is a circuit breaker someone has added. It isn't factory installed.

jhow66 · 06-09-2008, 03:17 PM

Trace wire off the small circuit breaker to see where it goes.

Longhorn Man · 06-09-2008, 04:56 PM

The horn relay is working properly. You have a problem up in the column with the horn button grounding out. The 2 most likely causes are an aftermarket wheel improperly installed, or a loose turn signal switch lever. Some one unplugged the horn(s) to shut them up and never fixed it.
As said before, the small one is a circuit breaker, as found at any parts store for the last 20+ years.

caminokid · 06-09-2008, 05:19 PM

That small relay has to be something someone added. I went and looked at my 69 step and there isnt one there. And I know when I ripped both of the 69 fleets apart...neither one has it either.

Hair · 06-09-2008, 05:41 PM

Longhorn Man...you're good.
I've noticed that the previous owner has unhooked the horn, just as you said. It has the original steering wheel though. I think the horn has a mechanical problem, not an electrical one, because when I plug the horn back up it works fine, but sometimes the horn button will stay down until I pry it back up. After I pry it back up the horn quits. It's like the horn button hangs up on something in there, any ideas? I'm thinking that even though the horn is unplugged maybe the horn button was mashed in and it burnt up the relay...could that happen? Because I pulled the relay cover off and it is definetly toast.

caminokid · 06-09-2008, 05:54 PM

I was just thinking about something funny. When I got my 69 fleet last year...everytime I turn the wheel to the right the horn would blow. I unhooked my relay to stop that problem. Years ago my best friends mom had a 70 that did the same thing!

Hair · 06-10-2008, 05:27 PM

Quote:

Originally Posted by Longhorn Man

The horn relay is working properly. You have a problem up in the column with the horn button grounding out. The 2 most likely causes are an aftermarket wheel improperly installed, or a loose turn signal switch lever. Some one unplugged the horn(s) to shut them up and never fixed it.
As said before, the small one is a circuit breaker, as found at any parts store for the last 20+ years.

How do I get to the loose turn signal switch lever??

HavinSomeFun · 06-10-2008, 08:36 PM

is that the rare corvette option?

I couldn't help myself....

Longhorn Man · 06-10-2008, 09:00 PM

you need a steering wheel puller.
Pop off the horn button
remove retaining nut holdiong on the wheel (3/4 I think?)
remove wheel per tool instructions.
slide the canceling cam by sliding up off the shaft.
carefully tighten the phillips screw that holds the arm. Not a bad I dea to remove the screw, and put some thread locker on it.
If the plastic it is mounted on is cracked, then a new signal switch or a repair kit is avalible.

badpeanut · 06-10-2008, 10:24 PM

Quote:

Originally Posted by Hair

How do I get to the loose turn signal switch lever??

Do what Longhorn Man says.

I use the following puller for steering wheels and it works fine: http://www.harborfreight.com/cpi/cta...emnumber=37824

Longhorn Man · 06-11-2008, 01:05 AM

that's not a bad lookin set.

06-09-2008, 01:16 PM	#1
Hair Registered User Join Date: Mar 2008 Location: Tullahoma, TN Posts: 406	What are these relays What is the bigger relay to the upper right of the fuse box? Mine is burnt up and it was making my battery go dead over night. I unhooked it and now I don't miss anything and my battery is good, so what does it do and what is it? Also, what is the smaller relay at the borrom right of the fuse box? Both of the wires that are hooked to mine are cut, so what is it supposed to do? Attached Images

06-09-2008, 01:32 PM	#2
Hair Registered User Join Date: Mar 2008 Location: Tullahoma, TN Posts: 406	Re: What are these relays This one right here. Attached Images

06-09-2008, 01:39 PM	#3
rscam Registered User Join Date: Nov 2005 Location: Monroe,Georgia Posts: 313	Re: What are these relays Big one is the Horn relay. I just replaced mine yesterday. Someone else will have to help with the smaller one. If not look on here for wiring diagrams and trace the wires. Thats how I found the horn relay.

06-09-2008, 01:46 PM	#4
Hair Registered User Join Date: Mar 2008 Location: Tullahoma, TN Posts: 406	Re: What are these relays Could it be an anti-dieseling relay?

06-09-2008, 01:55 PM	#5
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: What are these relays The small one looks like a circuit breaker to me. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

06-09-2008, 02:09 PM	#6
Luvlegs Registered User Join Date: Sep 2005 Location: Smith Mountain Lake Virginia Posts: 1,537	Re: What are these relays I've had 67, 68, 70 and 72 fuse blocks in my hands and haven't seen a relay/circuit breaker there before.... I'm gonna sit down now case'n I learn sumpin new... __________________ "A cat will almost always blink when hit between the eyes with a ball peen hammer" (you don't always have to state the obvious) Wear your PPE! You can eat with false teeth but you can't see with a false eye. 1959 Studebaker Silverhawk 350/400 1972 C10 L6 3OTT 2005 F350 - Built - whew!

06-09-2008, 02:13 PM	#7
matthufham Registered User Join Date: Feb 2005 Location: Carl Junction, Missouri Posts: 2,061	Re: What are these relays the lower one isn't factory

06-09-2008, 02:14 PM	#8
Hair Registered User Join Date: Mar 2008 Location: Tullahoma, TN Posts: 406	Re: What are these relays Oh, by the way, this is a 1971 GMC 6 cylinder, 2wd 1/2 ton with no A/C.

06-09-2008, 02:15 PM	#9
Lugnut64052 Middle-aged Curmudgeon Join Date: Jun 2008 Location: Independence, MO Posts: 753	Re: What are these relays The smaller one (with your finger on it in the first picture) is a circuit breaker someone has added. It isn't factory installed.

06-09-2008, 03:17 PM	#10
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: What are these relays Trace wire off the small circuit breaker to see where it goes. __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

06-09-2008, 04:56 PM	#11
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: What are these relays The horn relay is working properly. You have a problem up in the column with the horn button grounding out. The 2 most likely causes are an aftermarket wheel improperly installed, or a loose turn signal switch lever. Some one unplugged the horn(s) to shut them up and never fixed it. As said before, the small one is a circuit breaker, as found at any parts store for the last 20+ years.

06-09-2008, 05:19 PM	#12
caminokid Chevy nut Join Date: Jun 2007 Location: Springfield, Illinois Posts: 2,266	Re: What are these relays That small relay has to be something someone added. I went and looked at my 69 step and there isnt one there. And I know when I ripped both of the 69 fleets apart...neither one has it either. __________________ 84 Chevy Custom Deluxe 1/2 Ton Named Fade To Black II "Remember kids there is NO replacement for displacement!"

06-09-2008, 05:41 PM	#13
Hair Registered User Join Date: Mar 2008 Location: Tullahoma, TN Posts: 406	Re: What are these relays Longhorn Man...you're good. I've noticed that the previous owner has unhooked the horn, just as you said. It has the original steering wheel though. I think the horn has a mechanical problem, not an electrical one, because when I plug the horn back up it works fine, but sometimes the horn button will stay down until I pry it back up. After I pry it back up the horn quits. It's like the horn button hangs up on something in there, any ideas? I'm thinking that even though the horn is unplugged maybe the horn button was mashed in and it burnt up the relay...could that happen? Because I pulled the relay cover off and it is definetly toast.

06-09-2008, 05:54 PM	#14
caminokid Chevy nut Join Date: Jun 2007 Location: Springfield, Illinois Posts: 2,266	Re: What are these relays I was just thinking about something funny. When I got my 69 fleet last year...everytime I turn the wheel to the right the horn would blow. I unhooked my relay to stop that problem. Years ago my best friends mom had a 70 that did the same thing! __________________ 84 Chevy Custom Deluxe 1/2 Ton Named Fade To Black II "Remember kids there is NO replacement for displacement!"

06-10-2008, 08:36 PM	#16
HavinSomeFun Still Just Havin Some Fun! Join Date: Jun 2007 Location: Piedmont, Oklahoma Posts: 1,145	Re: What are these relays is that the rare corvette option? I couldn't help myself.... __________________ a green one with some stuff done to it....



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06-10-2008, 09:00 PM	#17
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: What are these relays you need a steering wheel puller. Pop off the horn button remove retaining nut holdiong on the wheel (3/4 I think?) remove wheel per tool instructions. slide the canceling cam by sliding up off the shaft. carefully tighten the phillips screw that holds the arm. Not a bad I dea to remove the screw, and put some thread locker on it. If the plastic it is mounted on is cracked, then a new signal switch or a repair kit is avalible.

06-11-2008, 01:05 AM	#19
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: What are these relays that's not a bad lookin set.

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